unplayable
adjective uk/ʌnˈpleɪ.ə.bəl/ us/ʌnˈpleɪ.ə.bəl/
(SPORT)
（球）无法击打的
An unplayable ball is hit or thrown so hard or skilfully that it is impossible to hit.
（场地尤因天气条件很糟而）不适宜比赛的
If an area of ground that is usually used for sports is unplayable, it cannot be played on, especially because of bad weather conditions.
(MUSIC)
（乐曲）太难而无法演奏的
A piece of music that is unplayable is too difficult to perform.